针对风力发电叶片在多风沙环境下的固体粒子冲蚀磨损行为,研究了风力发电叶片专用环氧树脂(EPIKOTETM RIM 135、EPIKURETM RIM H 137)、传统玻纤增强环氧复合材料和新型碳纳米纤维纸-玻纤/环氧复合材料的固体粒子冲蚀磨损行为,并测试了不同材料的玻璃化转变温度,进而对比分析了其对冲蚀磨损的影响;针对风力发电叶片在寒冷环境下表面容易结冰的现象,研究了上述三种材料表面的疏水性能,并测试了它们对水的接触角大小。结果表明:碳纳米纤维纸-玻纤/环氧复合材料具有良好的界面结合,且碳纳米纤维纸的引入提高了碳纳米纤维纸-玻纤/环氧复合材料的玻璃化转变温度(从55℃提高到63℃),从而改善了其耐固体粒子冲蚀磨损性能;同时,碳纳米纤维纸的加入改善了碳纳米纤维纸-玻纤/环氧复合材料的表面疏水性能(接触角从104°提高到131°)。
In the micro-molding of component with a micro-sized channel, the ability for polymer melt to flowing into the micro-channel in a macro-sized part is a big challenge. The multidimensional flow behaviors are included in the injection molding the macro-component with a micro-channel. In this case, a simplified model is used to analyze the flow behaviors of the macro-sized part within a micro-channel. The flow behaviors in the macro-cavity are estimated by using the finite element and finite difference methods. The influence of the injection rate, micro-channel size, heat transfer coefficient, and mold temperature on the flowing distance is investigated based on the non-isothermal analytic method. The results show that an increase in the radius of the micro-channel and mold temperature can improve effectively the flowing distance in the micro-channel.
